Cinelerra is still the only professional OSS video editor. Jashaka was also there for a while, but died of. The problem with Cinelerra(-cv) always have been suspicious code origin and total lack of any form of stability. It simply always crash after a few minutes. Too bad it was mostly feature complete to compete with pseudo-professional apps.

KDenLive is currently the best hope. Their current under the hood push to turn the amateur codebase into a future proof one is a clean sign that they have long term plans to be competitive. They also recently added a lot of advanced features like color-space based advanced color management and object tracking for layer synchronization.